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/*
* Copyright 2014-2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.net.topology;
import org.onosproject.net.Provided;
/**
* Represents a network topology computation snapshot.
*/
public interface Topology extends Provided {
/**
* Returns the time, specified in system nanos of when the topology became
* available.
*
* @return time in system nanos
*/
long time();
/**
* Returns the time, specified in system millis of when the topology became
* available.
*
* @return time in system nanos
*/
long creationTime();
/**
* Returns the time, specified in system nanos of how long the topology took
* to compute.
*
* @return elapsed time in system nanos
*/
long computeCost();
/**
* Returns the number of SCCs (strongly connected components) in the
* topology.
*
* @return number of clusters
*/
int clusterCount();
/**
* Returns the number of infrastructure devices in the topology.
*
* @return number of devices
*/
int deviceCount();
/**
* Returns the number of infrastructure links in the topology.
*
* @return number of links
*/
int linkCount();
}
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